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BakerAECOM will perform coastal engineering analyses to complete new detailed analyses of the Central Bay of San Francisco Bay and will review the North Bay coastal analyses and mapping, in total encompassing all or a portion of the bay shoreline areas within eight counties: Marin, Sonoma, Napa, Solano, Contra Costa, Alameda, San Mateo, and San Francisco Counties. The U.S. Army Corps of Engineers (USACE), San Francisco District, is studying the South Bay area of the San Francisco Bay. This study will be evaluated when finalized for possible adoption by FEMA as the source of new base flood elevation data in the South Bay and salt ponds areas. To learn more about the USACE study, please visit South San Francisco Bay Shoreline Study. A San Francisco Bay Coastal Study fact sheet is available for download here (PDF).
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General Information Regarding FEMA’s Coastal Mapping Efforts
- FEMA’s coastal mapping efforts benefit from new technologies, including Light Detection and Ranging (LIDAR), and the integration of studies conducted by FEMA. Studies by other entities such as the U.S. Army Corps of Engineers (USACE) will be evaluated for compatibility with FEMA’s study and mapping goals.
- FEMA is using two-dimensional (2D) hydrodynamic and wave models to perform severe winter-storm surge water level determination, wave height and run-up analyses to develop new coastal flood and wave elevations for total water level determinations throughout the coastal areas.
- The new studies will be based on current conditions, and, therefore, new Base Flood Elevations will be presented in the new Flood Insurance Study reports and on the Digital Flood Insurance Rate Maps (DFIRMs).
- FEMA is coordinating with Federal, State, Indian Tribal entities, regional and local stakeholders and will continue to coordinate with these stakeholders as the study progresses.